It works pretty nicely - though just as a framebuffer device so far. A specialized Xorg userspace driver for the new staging kernel driver is expected sometime soon. It already supplies KMS and can be used with the fbdev driver of Xorg. So next time you want to try a new kernel you can at least get into a working X without much ado. And there will surely be at least a simple driver coming with new kernels now. The first steps have been taken. And of course, all this is hopefully just the beginning...